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Uncertainty Analysis for Ship-Bank Interaction Tests in A circulating water channel

China Ocean Engineering 2020年第3期34卷 352-361页

作者： LIU Han MA Ning GU Xie-chong School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai Jiao Tong UniversityShanghai 200240China

This paper presents a systematic model test program to assess the uncertainty of the ship-bank interaction forces,using the planar motion mechanism(PMM)system in a circulating water channel(CWC).Therefore,the uncertainties due to ship-bank distance and water depth are considered,and they are calculated via the partial differentials of the regression formulae based on the test *** general part of the uncertainty analysis(UA)is performed according to the ITTC recommended procedure 7.5-02-06.04,while the uncertainty of speed is identified as the bias limit due to the flow velocity maldistribution in the *** each example test for the UA of ship-bank interaction forces,12 repeated measurements were *** from the UA show that the contribution of water depth error and flow velocity maldistribution to the total uncertainty is noticeable,and the paper explains how they increase with the change of the test *** present study will be useful in understanding the uncertainty regarding the ship-bank interaction force measurement in a CWC.

关键词： ship-bank interaction test uncertainty analysis circulating water channel bias limit ship-bank distance

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Physical Experiments to Investigate the Effects of Street Bottom Heating and Inflow Turbulence on Urban Street-Canyon Flow

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Advances in Atmospheric Sciences 2005年第2期22卷 230-237页

作者： Jae-Jin KIM Jong-Jin BAIK Climate Environment System Research Center Seoul National University Seoul 151-742 KoreaSchool of Earth and Environmental Sciences Seoul National University Seoul 151-742 Korea

The effects of street bottom heating and inflow turbulence on urbanstreet-canyon flow are experimentally investigated using a circulating water channel. Threeexperiments are carried out for a street canyon with a street aspect ratio of 1. Results from eachexperiment with bottom heating or inflow turbulence are compared with those without bottom heatingand appreciable inflow turbulence. It is demonstrated that street bottom heating or inflowturbulence increases the intensity of the canyon vortex. A possible explanation on how street bottomheating or inflow turbulence intensifies the canyon vortex is given from a fluid dynamicalviewpoint.

关键词： urban street-canyon flow street bottom heating inflow turbulence circulating water channel

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Investigations of influence of gas content in water to propeller cavitation noise

Investigations of influence of gas content in water to prope...

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2009中国控制与决策会议

作者： ZHANG Yong-kun,XIONG Ying Dept.of Naval Architecture & Ocean Engineering,Naval Univ.of Engineering,Wuhan 430033,China

Radiation noise of ship propeller model has been measured for investigating the influence of gas content in the water to propeller cavitation *** results of experimental investigations clearly show that if gas content is kept invariable,the total noise becomes loud as ship velocity increases;if ship velocity is a constant,the total noise decreases while gas content in water increases.

关键词： propeller cavitation noise circulating water channel

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